Cardboard box



p 1969 K. R. REENBERG 3,465,945

CARDBOARD BOX Filed Feb. 28, 1968 United States Patent Int. Cl. B65d /22 US. Cl. 229-34 2 Claims ABSTRACT OF THE DISCLOSURE A carton assembly produced from paperboard in which a cover is hingedly connected to the body forming portion, and in which both cover and body are produced as separate elements and incorporate outer base walls bordered at opposite sides by side walls having inwardly directed lock tabs; outer end walls having inwardly folded look panels, in which one of the lock panels has an inner wall positionable within the carton body or cover, and in which one of the members has a handle forming portion comprising a slit formed intermediately and through the outer wall panel at its base or hinge line, and the lock panel has formed at the hinge line between the inner wall and the lock panel element a struck-out handle tab which is extendable through the slit; and in which the other member includes at the end opposite that which the handle-forming portion is provided, a glue tab cut from the inner lock panel elements and hingedly connected to the upper edge thereof and secured to the adjacent end wall of the other member in which the handle-forming portion is provided.

The invention relates to cardboard boxes having a boxbody and a hinged cover body made of cardboard blanks and each consisting of a bottom surrounded along the edges by a front wall, a back wall and two side walls formed by folding the blanks along corresponding fold lines, whereby said side walls being provided at both their ends with end flaps adapted to be folded inwards on the insides of said front and back walls after these walls have been risen to stand perpendicular on said bottom parts whereas locking flaps on the front and back edges of the bottomparts are adapted to be folded around said endflaps for locking the sidewalls in the upright position.

The invention has for its object to indicate the construction of such a cardboard box, which can be made of relatively cheap and soft cardboard presenting a hard and smooth finish side, and a raw wrong side, in such a way that all visible surfaces of the boxparts, as well on the outside and on the inside of the box present the hard and smooth finish side of the cardboard, and therefore can receive further treatment by printing, stamping and embossing in the same way as boxes manufactured of much more expensive cardboards.

A further object of the invention consists therein to provide a box of the art specified, which in spite of being made of relatively soft cardboard presents parts with great stiffness and therefore can be used instead of known boxes made of stiffer and therefore more expensive materials, such as cardboards having double-sided finish, cardboard having a covering finish layers glued thereon or boxes made of metal or some sort of plastics.

A further object of the invention is to provide a box of the present art, having a fingergrip produced by appropriate cuttings in the blank and a hinge for connecting the box-body and the cover by similar means, whereby the hinge is placed in a position hidden from the outside and therefore invisible, when the box is closed by the cover.

An embodiment of the invention is shown in perspective views on the drawing, in which:

3,465,945 Patented Sept. 9, 1969 FIG. 1 shows the box and cover in half closed position as seen from the side,

FIG. 2 the same in full opened position,

FIG. 3 the box body with the parts not completely folded, and

FIG. 4 the cover-body in the same way.

The box consists in the embodiment shown of a boxbody 1 and a cover 2. Both these parts consist of a bottom 3 and 4 respectively, a wall, standing perpendicularly on the bottom at the edges hereof, and consisting of two side walls '5, 6 and 7, 8 respectively, a front wall 9 and 10 respectively, and a back wall 11 and 12 respectively.

The side walls have end flaps 13 in a manner well known in the art. These endfiaps are adapted to be folded inwards on the insides of the neighbouring front and back walls for being locked in this position by locking flaps 14, 15 and 16, 17 respectively on the front and back edges of the bottoms 3 and 4 respectively.

The sidewalls are formed of upfolded double flaps on the side edges of the bottomparts and are orientated in such a way that in using a cardboard having a smooth and hard finish on the one side, this side is turned out wards and presents itself as well on the outside as on the inside of the boxparts.

The locking flaps 14, 15 and 16, 17 on the box-body and the cover-body respectively are connected with coverfiaps 18 and 19 respectively, having nearly the same dimension as the bottom 3 and 4 respectively. In folding these coverfiaps inwards against the said bottoms in order to cover the whole inside of the same, the coverfiaps must be pressed downwards past the walls overcoming frictional resistance from these walls. Hereby a twofold object is attained. First the coverfiaps will fully cover the bottoms and therefore present the finish side outwards as well on the outside as on the inside of box parts. Second the coverflap will exert a standing pressure against the walls of the two boxparts, and therefore will make these parts as stiff and strong as if they were made of far more expensive materials than the soft cardboard with raw backside of which the box can be manufactured giving a finished box, which in practical use is fully satisfactory.

In the fold line between the locking flap 15 and the coverflap 18 in the box-body, an incision is made for cutting a tongue 20 free. In the foldline between the bottom 3 and the locking flap 14 a slit 21 corresponding to the tongue 20 is cut. Through this slit the tongue can be inserted when the locking flaps 14 and 15 are folded around the endflaps 13. Hereafter the tongue 20 will protrude on the outside of the box and on the front side of the box afford a fingergrip for opening the box as shown in FIG. 1.

In the fold line between the flaps 16 and 17 in the cover-body is made an incision for cutting a glue flap 22 free. By means of this flap the cover-body can be glued together with the box-body as shown in FIG. 2.

The fingergrip 20 as well as the glue flap 21 are held in position by the coverfiaps 18 respectively 19, hereby securing the proper working of these parts under use.

I claim:

1. In a hinged-cover, box assembly, a rectangular member including an outer wall bordered by opposed pairs of side and end wall panels, the side wall panels including inwardly directed end flaps, locking flaps hinged to the upper edge of said end wall panels and reverse-folded on the inner surface of the end wall panels, and an inner wall panel hinged to the edge of the reverse-folded lock panel at one end of the member and overlying the inner surface of said outer wall, said end wall and locking flap elements including a handle-forming construction including a slit extending transversely through and along an intermediate portion of the hinge line at the base of the outer end wall panele and at the adjacent end of the outer wall, and a handle-tab cut from the locking flap in alignment wit hsai'd slit and hinged at the juncture between said lock panel and inner wall and extending through said slit.

2. The structure as claimed in claim 1 including in combination, a second rectangular member hingedly connected to the end wall of said first-mentioned rectangular member opposite said handle-forming construction, said second rectangular member including outer and inner, overlying wall panel elements hinged at adjacent upper edges, 2. glue-table cut intermediately from the inner panel element and hinged to the outer panel element and disposed int he plane thereof, said tab element being secured 15 t0 the end Wall of said first-mentioned member opposite said handle forming construction.

References Cited UNITED STATES PATENTS 674,220 5/1901 Scott 229-34 1,895,778 1/1933 Andrews 22934 3,373,923 3/1968 Martelli 22934 10 DAVID M. BOCKENEK, Primary Examiner US. Cl. X.R. 22944, 52 

